baber/WOPTO huggingface dataset:
Patent GB-1390752-A (GB)
Title: Lead frames for holding and contacting semiconductor bodies
IPC: H01L21/60
Filed: 1972-05-25
Abstract: 1390752 Semi-conductor lead assemblies SIEMENS AG 25 May 1972 [3 June 1971] 51251/73 Divided out of 1389346 Heading H1K A process for the production of a lead frame, of the type having inwardly directed leads in the form of tongues for connection to semiconductor body electrodes and outer terminal legs each connected to one of the leads and being thicker than the leads and made of a different metal therefrom, comprises etching the inner leads and outer legs from a two-layer or multi-layer metallic material using appropriate etching masks, the various layers consisting of different metals having different etching resistances to the etchant or etchants. The multi-layer metallic material may comprise a relatively thicker brass layer 15 for forming the outer legs and a relatively thinner nickel layer 14 for forming the inner leads which may be bow-shaped. Etching is now carried out through photolithographically applied masks on each layer using an etching medium which attacks the nickel less than the brass in accordance with the greater thickness of the brass layer 15. Alternatively two selective etchants each of which attacks one only of the metals may be used. The semiconductor chip 16 can be mounted either side of the frame and subsequently embedded in a synthetic resin block.
Patent GB-1106440-A (GB)
Title: Glass runs
IPC: B60J10/18
Filed: 1965-12-02
Abstract: 1,106,440. Glass runs. GEBR. HAPPICH G.m.b.H. 2 Dec., 1965 [3 April, 1965], No. 51259/65. Heading E1J. A glass run particularly for motor vehicles comprises an elongate supporting metal frame 2 of U-section covered by a covering of plastics; rubber or the like and is provided with transverse strips by cutting out transverse slots, and the strips of longitudinally staggered arms of the U-section are cut transversely and the portions nearest the web of the U bent outwardly to form teeth 42, 48', of the same or different length so that when the guide is pressed home into its holder 8 the teeth snap in behind projections 9, 10 which may be of different heights. The outer portions of the strips are held together by a wire 7 enrolled in the end portions of the strips. Only alternate strips are formed with teeth. The base of the elongate U-section covered strips 3 is provided with two longitudinal ribs 20 of resilient material which are deformed with the normal broken line condition when the run is pressed home in its holder 8.
Patent GB-1093973-A (GB)
Title: Improvements relating to the treatment of catalysts
Inventor: HARRIS ROBERT JAMES KEIR
IPC: B01J21/20
Filed: 1966-11-16
Abstract: The process of the parent Specification for removing metallic contaminants from a cracking catalyst comprising SiO2 and one or more of Al2O3, MgO and ZrO2 and free from hydrogenating components susceptible to removal by chlorination, by contacting the catalyst at 350-600 DEG C. simultaneously with water-vapour and the vapour of a compound of general formula C.Cl2.XY where X and Y may be the same or different and selected from H, Cl, Br and F or where X and Y together may be O, is modified in that the catalyst is subsequently subjected to water-vapour alone at 350-600 DEG C.  Comparative examples demonstrate the efficacy of the process of the invention against the Parent Specification and the prior art.
Patent GB-1043048-A (GB)
Title: Process for the production of polyhalogenated polyphenyl benzenes and products thusobtained
IPC: C07C25/18
Filed: 1964-12-17
Abstract: Polyhalogenated derivatives of polyphenylbenzenes other than biphenyl are made by passing a gaseous mixture having a halogen basis of the polyphenylbenzene through a fluidized bed which is maintained (a) in a constant dense state of fluidization by the gaseous mixture and (b) at a higher temperature than the dewpoint of the desired product. Examples describe the production of polychloro-terphenyls and -quaterphenyls.
Patent GB-1169967-A (GB)
Title: Process for the bulk preparation of polymerisation products of vinyl chloride compositions containing vinyl acetate and ethylene copolymers at least partially grafted with vinyl chloride
IPC: C08F263/04
Filed: 1967-11-13
Abstract: 1,169,967. Ethylene-vinyl acetate copolymers grafted with vinyl chloride. PRODUITS CHIMIQUES PECHINEY-SAINT-GOBAIN. 13 Nov., 1967 [14 Nov., 1966], No. 51534/67. Heading C3G. An ethylene-vinyl acetate copolymer is grafted in bulk with vinyl chloride by dissolving the copolymer in liquid vinyl chloride monomer, the reaction medium so produced being then subjected to bulk graft polymerization in the presence of an appropriate catalyst. A further quantity of vinyl chloride may be added to the copolymer solution. The catalyst, e.g. (1) azodiisobutyonitrile, (2) lauroyl peroxide, (3) isopropyl peroxydicarbonate, (4) benzoyl peroxide or a mixture of (1) or (2) with sulphonyl cyclohexane acetyl peroxide or with (3), may be incorporated during the preparation of the copolymer solution or with the further quantity of vinyl chloride, if any. The polymerization may be carried out either at constant speed or with high-turbulence agitation in a first stage and low agitation speed in a second stage.
Patent GB-1183430-A (GB)
Title: Latch Needle for Knitting Machines
IPC: B23K26/20
Filed: 1968-10-31
Abstract: 1,183,430. Welding by fusion. THEODOR GROZ & SOEHNE, and ERNST BECKERT NADELFABRIK COMMANDIT-GES. 31 Oct., 1968 [18 Dec., 1967], No. 51585/68. Heading B3R. [Also in Division DIC] The pivot pin retaining the latch 4 of a knitting needle in its slot 3 is positively located in the pivot pin holes in the side cheeks of the shank by upsetting the ends of the pin, Fig. 3, or by screwing it in position or by an annular bead and annular groove pairing, and is additionally secured by welding the ends of the pin to the outside surfaces of the cheeks. The welding is effected by either laser beam or electron beam and in the latter case it is carried out in a vacuum. The welding region 10 is a ring in the region of the axle pin circumference on the outside of the shaft faces. Concentration of welding energy over an annular region may be attained as shown in Fig. 6 on plane A-A which is located in front of the focal point of an energy beam, the latter having a peripheral region with greater energy concentration than centre, so that the energy distribution occurs as shown in Fig. 7.
Patent GB-1376320-A (GB)
Title: Process for extraction of phosphorus compounds
IPC: C01B25/32
Filed: 1971-11-08
Abstract: 1376320 Precipitation vessel UNITED STATES GYPSUM CO 8 Nov 1971 [18 Nov 1970 19 Oct 1971] 51771/71 Heading B1X [Also in Division Cl]  A crystallizer for precipitation of salts (e.g. calcium phosphate) from a mineral acid comprises a tank 82, a pipe 100 rotatably mounted along the axis of the tank and having an input 92 for base at one end and at the other end at least two branches 104, 106 extending from the axis, each provided with at least one hole 105, 106; means (88 and 84) for delivering the acid concentrically to and exteriorly along pipe 100 to a position short of the branches, and means for rotating the pipe with respect to the tank and the delivery means.
Patent GB-1368123-A (GB)
Title: Swimming pools
IPC: E04H4/12
Filed: 1972-11-02
Abstract: 1368123 Swimming pools BIWATER TREATMENT CO Ltd 2 Nov 1972 [9 Nov 1971] 51986/71 Heading A4N [Also in Division B1] A swimming pool is provided with means for removing scum and surplus water, said means comprising a plurality of aligned channel members defining a main collecting channel 6 and a raised edge or barrier 8, each member having at least one depression 9 located so that there is a constant flow of water into the channel 6 across the weir formed by the depressions 9 as purified water enters the pool. The channel is substantially continuous and leads to an outlet or a small number of outlets communicating with filtering and/or purification devices from which the water is recirculated to the pool. The channel members have a rearwardly extending rim 19 and support a bedding layer 7 and tiles 11, 12. The tiles 12 have depressions forming a drain gutter 13 communicating with the channel 6 via pipes 14 and ducts 17, said gutter receiving surface water on the pool upper rim.
Patent GB-520618-A (GB)
Abstract: 520,618. Time switches. LANDIS &GYR AKT.-GES. Jan. 5, 1939, No. 381. Convention date, Nov. 19, 1938. [Class 38 (v)] Normally-closed contacts 15, 16 are momentarily opened at a time determined roughly ,by a slowly rotating cam disc 2 and accurately by a faster cam disc 19. The disc 2 removes a latching member for a short period of time during which the disc 19 actuates the contacts. Resting on a slowly moving cam 2 which rotates once per hour, are a pair of scissors levers 3, 4 pivoted together at 5, one 3 being pivoted at 6 to a fixed point and the other 4 being pulled down by a spring 8 and carrying a rod 7 which hooks under a second pair of scissors levers 9, 10. These are pivoted together at 11 and one 9 is pivoted to a fixed point 12 and the other 10 is pulled down by a spring 18 and carries a pin 13 which co-operates with a spring 14 carrying a contact 15 which engages another contact 16. As the cam 2 rotates in a clockwise direction an end of the lever 3 which is slightly shorter than the lever 4 drops down one of four cam steps, and the lever 4 is pulled down by the spring 8 with the bar 7 which allows the levers 9, 10 to rest on a second cam 19. This cam rotates eight times as fast as the cam 2 and is set so that the shorter lever 9 drops and the lever 11 turns and opens the switch for a short time such as one second until the lever 10 drops as the cam 19 rotates further, and the switch is closed. Continued rotation of the slow cam 2 then allows the lever 4 to turn into a position parallel with the lever 3 and the arrangement is reset with the switch still closed.
Patent GB-1391418-A (GB)
Title: Collector apparatus
IPC: B01D51/00
Filed: 1971-11-10
Abstract: 1391418 Removing particulate material from an air stream; cyclone separator NATIONAL FOUNDRY EQUIPMENT CO Inc 10 Nov 1971 [25 Jan 1971] 52200/71 Headings BIT and B2P A vacuum collection system for association with a collection hopper 11 has a platform base 13 with channel means 14 suitable for lifting tines of a fork lift truck. The base is sealed to the hopper by gasket 21 and has an air/particulate material intake 18 and an air exhaust orifice 19 and a particulate material orifice being in open communication with the hopper through the base. Also mounted on the base is a displacement blower 16 and the separation means 17. Various means for separating the particles from the air-stream are described and these may be used in combination. Thus the first stage for removing the heavier particles can be a cyclone separator (Figure 4 not shown) the next stage is an accelerating nozzle stage more specifically described and claimed in Specification 1391419 and a third air filter stage (Fig. 2 not shown).
Patent GB-1483055-A (GB)
Title: Porous refractory ceramic materials
IPC: C04B35/632
Filed: 1973-11-12
Abstract: 1483055 Ceramics FOSECO INTERNATIONAL Ltd 18 Oct 1974 [12 Nov 1973] 52449/73 Heading C1J A replica of a body of reticulated organic foam consists wholly or substantially of ceramic fibres, which can be bonded together by heating or by the dried residue of an oxide hydrosol (e.g. of alumina or silica) or other inorganic refractory binder (e.g. aluminium hydrogenorthophosphate, aluminium chromium hydrogenorthophosphate, a suitable chromium salt, zirconium hydroxy-nitrate, zirconium hydroxyacetate, phosphoric acid or aluminium hydroxychloride). Fibres are glass wool, slag wool, asbestos, SiO 2 , aluminosilicate, Al 2 O 3 , ZrO 2  or glass ceramics, while the foam may be polyurethane. The ceramic replica may be employed as a support for catalysts; accordingly, therefore, there may be an addition of catalytic material in particulate form during the preparation of the ceramic replica, but any non- fibrous particulate matter present in the ceramic replica must make no significant contribution to the strength thereof. The ceramic replica may be prepared by impregnating a body of reticulated organic foam with a slurry of finely divided inorganic fibres and drying and firing the so-impregnated body. In a preferred alternative procedure, a reticulated polyester polyurethane foam is pretreated with a base, preferably a volatile organic base, e.g. monoethanolamine, and the polyurethane body is then plunged into a slurry of short ceramic fibres in an aqueous solution of a modified polyvinyl polycarboxylic acid of a type whose solutions undergo a sharp viscosity increase when neutralized. The resulting body is centrifuged, dried and fired. If preferred, the steps of dipping into the slurry and centrifuging may be repeatedly carried out until the desired coating thickness is built up.
Patent GB-1520540-A (GB)
Title: Stabilisers for formals
IPC: C08F2/38
Filed: 1976-12-16
Abstract: 1520540 Vinyl acetate telomers and derivatives thereof PRODUITS CHIMIQUES UGINE KUHLMANN 16 Dec 1976 [19 Dec 1975] 52485/76 Heading C3P [Also in Division C2] Partial formals of vinyl acetate telomers of M.W. 500-5000 are prepared by (a) telomerizing vinyl acetate in the presence of a free-radical generator and a non-halogenated telogen, the molar ratio of telogen/vinyl acetate being 0À01- 4, (b) after possible distillation of unreacted vinyl acetate and/or telogen, partially reacting the telomer with formaldehyde in the presence of a strong mineral acid and in an organic solvent of formula CH3-R in which R is nitro, cyano or carboxyl, the molar ratio of formaldehyde to initial vinyl acetate being from 0À2-1, and (c) isolating the partial formal by precipitation in alkaline water. In Examples, vinyl acetate is telomerized in the presence of benzoyl peroxide and one of methyl ethyl ketone, 3- pentanone, 2,4-pentanedione, cyclohexanone, acetaldehyde, butyraldehyde or diethyl phosphite as telogen; the products are then reacted with formaldehyde in the presence of concentrated sulphuric acid and in some cases also hydrogen peroxide, in a solvent which is glacial acetic acid, nitromethane or acetonitrile; and the final products are partially neutralized with sodium hydroxide and isolated. Use.-Stabilizers for aqueous formaldehyde solutions.
Patent GB-1358434-A (GB)
Title: Burner head for a gas brazing torch
IPC: F23D14/54
Filed: 1972-11-27
Abstract: 1358434 Burner heads NORTH WESTERN GAS BOARD 27 Nov 1972 [13 Nov 1971] 52812/71 Heading F4T  A burner head for a gas brazing torch comprises a body 1 having a rear tubular portion 2 adapted to be fitted into the torch and having an axial air inlet 4 and radial gas inlets 3, and a front tubular portion of greater diameter terminating in a burner shroud 5, an insert being fixed in the front portion and provided with a burner outlet port 7, a ring of retention flame ports 8 and a flange 10 the rear face 11 of which is chamfered and which leaves a retention flame annulus 12 between its periphery and the inner surface of the front portion immediately behind the burner shroud.
Patent GB-1137196-A (GB)
Title: Improvements in or relating to video telephone sets
IPC: H04N7/14
Filed: 1967-11-21
Abstract: 1,137,196. Inter-communication systems. NIPPON ELECTRIC CO. Ltd. 21 Nov., 1967 [21 Nov., 1966], No. 52933/67. Heading H4K. A feed-bridge, provided at a switchboard for the talking path of a connection between stations which are also connected by a separate video link, has a relay 21 to detect reply by the called station, operation of relay 21 reversing the polarity of battery to the calling station so as to operate relay 12a by means of which a synchronizing signal, separated from the video signal received from the called station by a circuit 5a, is connected over switch 4a to the video pick-up at the calling station. Relays 10a, 10b at the stations respond to the offhook condition of the speech path to activate the video equipment.
Patent GB-1248133-A (GB)
Title: Radial phonograph pickup arm and turntable combination using gas bearings
Inventor: EISNER IRA LEONARD
IPC: G11B19/20
Filed: 1969-10-31
Abstract: 1,248,133. Gramophone pick-up arms. I. L. EISNER. 31 Oct., 1969, No. 53357/69. Heading G5R. A radially-tracking pick-up head 10 is carried on one arm 13 of an L-shaped unit, of which the other arm 15 is cylindrical and slides on an air or gas bearing in a sleeve 16. The arm 15 may include a lead counterbalance weight 20, and the playing weight of the head 10 may be adjusted by means of a weight 21 sliding on the arm 13. The turntable 1 also may be supported on an air or gas bearing, both bearings being fed by a single blower 6 driven by the turntable drive motor 5.
Patent GB-1438988-A (GB)
Title: Optical communication system
IPC: C03B37/027
Filed: 1973-11-19
Abstract: 1438988 Light guides WESTERN ELECTRIC CO Inc 19 Nov 1973 [22 Nov 1972] 53557/73 Heading G2J An optical waveguide 10 for propagating at least one mode comprises a filament, e.g. of fused silica, having a relatively thick portion 11 at the centre and at least two relatively thin portions 12À1, 12À2 at the ends, the portions 12À1, 12À2 providing mechanical support for the portion 11. The filament is located in a cylinder 13 having a lossy jacket 14, and the space 15 may be filled with an optically non-linear material, e.g. a liquid, or the exposed surface of the portion 11 may be wholly or partly coated with a non-linear material, and/or with a linear material. In a modification, Fig. 4, (not shown) the thicker portion is confined to the top side of the filament. A plurality of filaments may be enclosed in a common sheath, and the portion 11 may be circular or semicircular in crosssection.
Patent GB-1159887-A (GB)
Title: Sequential Frequency Combiner for Frequency Standard Systems
Inventor: HELGESSON ALAN LEE
IPC: H03L7/26
Filed: 1967-11-24
Abstract: 1,159,887. Automatic phase control systems. VARIAN ASSOCIATES. 24 Nov.. 1967 [9 Dec., 1966], No. 53663/67. Heading H3A. A frequency standard apparatus comprises means for selecting one of a plurality of standard frequency generators 1-4 as a master standard and transmitting its output to the output terminal, means for phase-locking the other generators to the master, and means for selecting another master if the first one should fail. As shown one of the generators is connected through a gate 6-9 to a line 5 which is connected to an output terminal 1 via a crystal filter 17 and amplifier 20; a second output channel to terminal 2 guards against failure of the crystal 17. The signal on line 5 is inverted in unit 21 to provide the reference signal for phase detectors 22-25, the outputs of which are fed to a control circuit 31 for controlling the respective generators. The outputs of the phase detectors are monitored by a threshold circuit 32 which detects when a predetermined phase difference (e.g. 12 degrees) is exceeded by any of the generators; in such a case a corresponding lamp 33 is lit, and a signal is fed to programmer 15 to prevent that generator from being selected as master. The amplitude of the signal on line 5 is monitored in circuit 35, and if it is too low the programme unit 15 is activated to select a new master. In the example shown generators 1 and 2 are atomic standards which provide alarm outputs when synchronization is lost; these alarm outputs are fed to programme unit 15 to cause a change if that generator is the master or otherwise to prevent the generator being selected as the master. The programme unit 15 opens the gate 6-9 corresponding to the selected master and also energizes a corresponding indicator lamp 37. The crystal filters 17 and 18 should have a decay time greater than the switching time to ensure continuity of the output when the master standard is changed.
Patent GB-1502286-A (GB)
Title: Food steamer and warmer
IPC: A47J27/04
Filed: 1974-12-13
Abstract: 1502286 Steaming food A COPELAND 9 Jan 1976 [13 Dec 1974] 54093/74 Heading A4D A food steamer comprises a container 2 for boiling water, means for supporting containers 10, 11, 19 for food one above the other, and a cover 3 for containing the food, the cover being doublewalled. As shown, the steamer is suitable to be placed over an electric heating ring 15 or other heat source and comprises a rectangular cover 3 having inner and outer walls 4, 6 and an access door 20. Alternatively, the heat source, either electric, gas, or oil, with a temperature regulator, is incorporated into the steamer, which may be portable. Plastics coated wire mesh trays 9 supported on dimples formed in the inner wall 4 carry the food on plates, bowls 10, poachers 11, or disposable foil containers 19. Dimples 13 maintain the spacing between the walls 4, 6 of the cover and vents 18 maintain a flow of hot air in the space 7 between these walls. Vents 14 allow steam to escape, a handle 12 may be used to carry the steamer, and a tube 16 allows water to be added to the container 2. The steamer is of stainless steel or aluminium and the water container may also be of a ceramic or glass.
Patent GB-1116240-A (GB)
Title: Improvements in or relating to light-sensitive materials containing a photo-crosslinkable composition
IPC: C08G18/60
Filed: 1965-12-21
Abstract: Photo-crosslinkable compositions comprise in admixture a polymer containing units of a N-methylol ester or ether derivative of acrylamide or methacrylamide, and a compound capable of splitting off hydrogen ions under the influence of U.V. radiation having the formula <FORM:1116240/C3/1> wherein R3 represents C1-C3 alkyl, aryl, halogen, amino, alkylamino, hydroxy, alkoxy, carbonamide or hydrogen, R4 represents hydrogen or C1-C3 alkyl, R5 represents C1-C4\t alkyl, and X- represents an anion.  The polymer may contain units of other monomers, e.g. acrylic or methacrylic acid and aliphatic esters, amides and nitriles thereof.  For coating the compositions on to a support, the polymer and quaternary salt can be dissolved in solvent such as water, lower alcohols or acetone.  The composition may also include dissobutyl-naphthalene-1-sodium sulphonate, India ink, fuchsin or saponine.ALSO:A quaternary salt of 3-diazoquinoline-4-one is prepared by heating the latter in benzene with methyl p-toluenesulphonate.
Patent GB-1448385-A (GB)
Title: Electrophotographic apparatus and transfer method
IPC: G03G15/20
Filed: 1973-11-22
Abstract: 1448385 Transferring powder images XEROX CORP 22 Nov 1973 [24 Nov 1972] 54229/73 Heading B6C [Also in Division H1] The transfer of a powder image 10 from an original support 11 (e.g. a xerographic belt) to a transfer member 16 (e.g. a sheet of copy paper) is effected by passing the support and the transfer member through a nip formed between a conductive member (e.g. a roller 12) and a roller electrode 15 which is biased by a constant current source 23 such that the field generated in the region immediately preceding the nip is below air-ionization potential and the field immediately following the nip is above air ionization potential. The roller electrode comprises a conductive core 22 and a layer 21 of an electrically relaxible material which takes long enough to transmit a charge from core 22 to the nip for a non-symmetrical voltage profile to be created about the nip. A "leaky" insulating layer 20 is provided on the relaxible material so that the charge acquired by the outer surface of the roller electrode is dissipated generally within one revolution. A control circuit maintains the current level constant so that the fields at the nip region are held at predetermined levels with respect to the air ionization level.